Southwest Airlines has a flexible flight change policy that allows passengers to modify their reservations if needed. Here are the key details of Southwest flight change policy:

1. No Change Fees: Southwest Airlines does not charge change fees for flight modifications. Whether you need to change your flight date, time, or destination, you won't be penalized with additional fees.

2. Fare Differences Apply: While Southwest doesn't impose change fees, fare differences may apply when you modify your reservation. If the new flight you choose has a higher fare, you'll need to pay the fare difference. Conversely, if the new flight has a lower fare, you may receive a travel credit for the remaining amount.

3. Change Options: Southwest provides flexibility in changing flights. You can modify your reservation online through the Southwest website or mobile app. Alternatively, you can contact Southwest's customer service or visit a Southwest ticket counter at the airport to make changes.

4. Same-Day Standby: Southwest offers a same-day standby option for passengers who wish to travel on an earlier flight on their scheduled day of departure. You can request to fly standby at no extra charge, but it's subject to seat availability.

5. Cancel and Refund: If you decide to cancel your Southwest flight, you can receive a refund in the form of original payment or Southwest travel funds, depending on the ticket type and fare rules. It's important to review the specific fare rules associated with your ticket to understand the refund options.

It's worth noting that while these policies were accurate as of my last knowledge update in September 2021, airline policies can change over time. To ensure you have the most up-to-date information, it's recommended to visit the official Southwest Airlines website or contact their customer service directly.